High frequency conductor



May 3, 1938. F. KLIMMER HIGH FREQUENCY CONDUCTOR Filed May 28, 1936 Rams TYAaL P01. Y5 T YPO POLYJ TYPO.

Fig. 1

P LXSTYPOL P01. Y5 T ROL [NI/EN TO/P, en/v2 1 IMMEA Patented May3, 1938PATENT OFFICE HIGH FREQUENCY CONDUCTOR Applicationlayll,

lnGerlnany In constructing multi-core conductors it hashithertobeenusualtoinsulatethecoresandthenstrandthemtogethensothatthediatance between two cores is about twicethe distance 5 from the outside covering. his construction istweentheconduetorsisabout50%oithediameterotthepair.l'brlowirequencythecapacityistheonlyquantity for whichthecon- Such-aeonductorcan bereini'orcedasrenuired. utionoithiskindhasthe tageamountoi' solid lnaterlalcanbekept smallandthedistanoebetweenthecoresiaParticularly good properties of the insulation are obtained when thecords and bands are made of mlmyrol, which combines great mechanicalstrength with low di-electric constants and very low angle of loss.

In order that the conductor may have, as far as possible, a circularcross-section, it is advisable towormthecoreswhicharewoundround withcordsandtwistedtogether. 'lhiswormingisin practice carried out in theform of helices, such as are described in the American patentapplication 50,034, in order to keep the amount of solid material assmall as possible. Also such helices can be used for the re-intorcementof the external insulating covering.

A constructional exampleot the invention is u illustrated in theaccompanying drawing. in whichrlg. l isa cross-section andl'lg. 2isaside elevation. The two cores 1: are each wrapped round with a cord bpreferably of polystyrol. In the spaces leit when these conductors aretwisted together, polystyrol helices c are inserted and the whole iswound round with polystyrol bands '4 ande. 'lhecorethusiormedlsseparated from the outer metallic covering h by a further heiixI.

What I claim is: v

A high frequency electrical cable comprising a plurality of conductorstwisted together, poly-- styrol threads wound helically around the individual conductors, self-supporting mm:helicqinthewormingspacesbetweenthe conductornbandsotpolystyrol laidaroundthe conductonandhelices,anenternalsheathand sellsupporting 901mlhelices wound .helicallyaroundtheinnerstructure,i'orspacingthesheaththerefrom. u

